20534534 has 4 divisors (see below), whose sum is σ = 30801804. Its totient is φ = 10267266.

The previous prime is 20534533. The next prime is 20534539. The reversal of 20534534 is 43543502.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5133632 + ... + 5133635.

It is an arithmetic number, because the mean of its divisors is an integer number (7700451).

Almost surely, 2^20534534 is an apocalyptic number.

20534534 is a deficient number, since it is larger than the sum of its proper divisors (10267270).

20534534 is a wasteful number, since it uses less digits than its factorization.

20534534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10267269.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20534534 is about 4531.5046066401. The cubic root of 20534534 is about 273.8387795422.

It can be divided in two parts, 205345 and 34, that added together give a cube (205379 = 59³).

The spelling of 20534534 in words is "twenty million, five hundred thirty-four thousand, five hundred thirty-four".